In December, the Navy submitted a tank upgrade study that examines three single-wall options and includes improved repair and restoration as the most basic option, as well as two double-wall ...

RICHLAND — Inspectors at the Hanford Nuclear Reservation in south-central Washington state have found at least seven leaks in the site’s oldest double-walled radioactive waste storage tank.

It was the first of the 28 double-walled tanks at Hanford to be found to have leaked. That waste is being pumped back into the primary tank. The sprawling Hanford site is located near Richland ...

In December, the Navy submitted a tank upgrade study that examines three single-wall options and includes improved repair and restoration as the most basic option, as well as two double-wall ...

The most toxic wastes are stored in 177 giant underground tanks. There are 28 newer double-walled tanks and 149 single-walled tanks, some of which date back to the dawn of the Cold War.